"[The best personal finance advice] can fit on a 3-by-5 index card, and is available for free in the library," Pollack said during the interview. "So, if you're paying someone for advice, almost by definition, you're probably getting the wrong advice because the correct advice is so straightforward."

Pollack's comment was not intended to be the centerpiece of the interview. If anything, it was a one-off comment and he did not even elaborate on the specific financial advice.

After Pollack posted the video, he started receiving emails asking where to find this index card and what was the advice.

The problem: the index card didn't exist.

So, Pollack grabbed an index card from his daughter, wrote several personal finance principles, snapped a photo with his phone and posted it online. The actual index card was 4-by-6 inches (rather than 3-by-5).